A man sold 20 articles for Rs. 60 and gained 20%. How many articles did he buy for Rs.60?

A. 22
B. 24
C. 25
D. 26
Explanation:
S.P of 20 articles = Rs. 60,
Gain = 20%
C.P of 20 articles = Rs. (100/120 × 60) = Rs. 50
Rs. 50, he bought = 20 articles
Rs. 60, he bought = (20/50 × 60) = 24 articles